SMuK 2023 – wissenschaftliches Programm

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HK: Fachverband Physik der Hadronen und Kerne

HK 74: Poster

HK 74.14: Poster

Donnerstag, 23. März 2023, 17:30–19:00, HSZ EG

Impact of the charm fragmentation fractions on the dielectron spectrum in pp collisions at the LHC — •Emma Ege for the ALICE Germany collaboration — Institut für Kernphysik, Goethe-Universität Frankfurt, Germany

Charm and anti-charm quarks are produced abundantly in pp collisions at LHC energies. Until recently, it was assumed that the hadronization process, i.e. the formation of charm hadrons from the partonic matter, can be described by universal fragmentation functions. Measurements performed by the ALICE Collaboration have nevertheless shown an enhancement of the relative charm-baryon contributions with respect to the ones observed in e⁺e⁻ collisions. This suggests a significant difference of the fragmentation fractions in hadronic collisions at the LHC compared to e⁺e⁻ and ep collisions at lower energies. The PYTHIA event generator is able to reproduce part of these findings by including string fragmentation beyond the leading color approximation.

On this poster, we will discuss how sensitive the dielectron yield from correlated open-charm hadron decays is from the charm hadronization process. For this purpose, predictions with the PYTHIA generator using different tunes will be compared. Additionally, the consequences on the heavy-flavour cross section measurements via the dielectron channel will be shown.